title: Effects of training on hearing protector attenuation.
abstract: The effect of training instruction, whether presented as the manufacturer's printed instructions, a short video training session specific to the product, or as a one-on-one training session was evaluated using four hearing protection devices with eight groups of subjects. Naïve subjects were recruited and tested using three different forms of training: written, video, and individual training. The group averages for A-weighted attenuation were not statistically significant when compared between the video or the written instruction conditions, regardless of presentation order. The experimenter-trained A-weighted attenuations were significantly greater than the written and video instruction for most of the protectors and groups. For each earplug, the noise reduction statistic for A-weighting (NRS A ) and the associated confidence intervals were calculated for the 80 th and 20 th percentiles of protection. Across subject groups for each protector, the differences between NRS A ratings were found to be not statistically significant. Several comparisons evaluating the order of testing, the type of testing, and statistical tests of the performance across the groups are presented.
authors.affiliation: National Institute for Occupational Safety and Health, Cincinnati, OH 45226-1998, USA. wjm4@cdc.gov
authors.forename: William J
authors.initials: WJ
authors.lastname: Murphy
authors.forename: Mark R
authors.initials: MR
authors.lastname: Stephenson
authors.forename: David C
authors.initials: DC
authors.lastname: Byrne
authors.forename: Brad
authors.initials: B
authors.lastname: Witt
authors.forename: Jesse
authors.initials: J
authors.lastname: Duran
mesh_terms: D001299:Audiometry; D004430:Ear Protective Devices; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D007318:Inservice Training; D009314:National Institute for Occupational Safety and Health, U.S.; D009623:Noise, Occupational / Q000009:adverse effects*; D009784:Occupational Diseases / Q000517:prevention & control*; D015203:Reproducibility of Results; D013664:Teaching Materials; D014481:United States